Hello, newbie here and I hope this isn't a time-wasting post. I fought an infection for the past several days on a laptop, but I finally beat it. In the process I believe one of my USB thumbdrives got infected. I have connected this thumbdrive on two different PC's since then and both of them have shown signs of infection. Running Malwarebytes, and Combo fix then trendmicro's housecall has them clean (I think). One thing that was common to both cleaning processes is that a message saying "pev.cfexe has encountered a problem and cannot continue running" popped up while combo-fix was running. I don't find that file anywere, but I do find pev.exe on both pc's under c:\windows, and the create time is about the time I connected the usb drive on each respective pc.
Does anyone know if the file pev.exe is a valid file or if its presence poses a threat to my PC's?
The infection I was fighting seems to have many names, but the main symptom was a desktop image that said "YOUR SYSTEM IS INFECTED" and a paragraph about what to do about it. This image was named critical_warning.html and was found under c:\windows\system32.
Thanks in advance for any assistance!